Vacuum Tube - 6CA7, JJ Electronics

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Vacuum Tube - 6CA7, JJ Electronics

Starting at: $16.45
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The JJ Electronic 6CA7 is a true to form reproduction of a classic tube that will work in most EL34 amps. The 6CA7 is often considered the American cousin to the British EL34. Sonically, this tube is closer to a 6L6 than an EL34 but without the sometimes harsh high end of the 6L6. The JJ 6CA7 offers warm highs with punchy articulate mids and tight lows. Wielding even more power than a KT77, this tube is a great choice for people looking for a change in their EL34 amp’s tone or want to push their levels that much further.

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RoHS Compliant
Item ID:
JJ Electronics, Apex Matched
Part Numbers
Single or MatchedOur Part NumberUPC/EAN
Apex Burned-In Matched PairT-6CA7-JJ-MPB609722148801
Apex Burned-In Matched QuadT-6CA7-JJ-MQB609722148818
Apex Matched PairT-6CA7-JJ-MP609722127486
Apex Matched QuadT-6CA7-JJ-MQ609722127493
Product Measurements
Body Height100 mm
Cathode Current150 mA max
Filament current (If)1.5 A
Filament voltage (Uf)6.3 V
Grid 2 dissipation (Wg2)8 W max
Grid capacitance (cg1)16.5 pF
Grid to plate capacitance (cg1-a)1 pF
Grid voltage 1 (Ug1)32 V, -100 V min
Grid voltage 2 (Ug2)400 V typical, 500 V max
Heater to cathode voltage (Uk/f)200 V max
Internal resistance (Ri)24 kΩ
Item Diameter38 mm
Item Height115 mm
Plate (anode) capacitance (ca)9 pF
Plate (anode) current (Ia)50 mA
Plate (anode) dissipation (Wa)25 W max
Plate (anode) voltage (Ua)400 V typical, 800 V max
Transconductance (s)9.5 mA/V
Packaging Information
Packaging DimensionsSingle version1.6 in. × 1.6 in. × 4.6 in.
Apex Matched Pair version1.9 in. × 3.3 in. × 4.6 in.
Apex Burned-In Matched Pair version4.5 in. × 3.3 in. × 1.8 in.
Apex Matched Quad version3.3 in. × 3.3 in. × 4.6 in.
Apex Burned-In Matched Quad version4.5 in. × 3.3 in. × 3.3 in.
Weight (Packaging)Single version0.15 lbs.
Apex Matched Pair version0.3 lbs.
Apex Burned-In Matched Pair version0.3 lbs.
Apex Matched Quad version0.6 lbs.
Apex Burned-In Matched Quad version0.6 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet (497.92 KB)Specification Sheet

Questions and Answers

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Asked by Anonymous on May 7th, 2016. 1 person subscribed to this question
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May 10th, 2016
Staff Member
Top Contributor
I would suggest either this tube or the E34L for maximum headroom. This should help a bit with your early breakup. Additionally, with the tubes I mentioned you can always request the highest PC/TC numbers for least breakup.
August 7th, 2018
From what I've been discovering online, the answer to this largely lies with the preamp section, namely the four (4) 12AX7s. I'm changing these to, inline from the guitar input jack (call it V1) all the way over: V1 = 12AY7, V2 = 12AX7, V3 = 12AX7, V4 = 5157. Hopefully by this coming Friday 07/10, I'll have a smoother, more gradual gain, which it's hoped, translates to a more singing, far less crosscut crunch tone in the overdrive channel.
Asked by Anonymous on April 25th, 2016. 1 person subscribed to this question
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April 27th, 2016
Staff Member
Top Contributor
You can provide the PC/TC numbers and it's possible we could find similar ratings. There is the chance the number scale will differ with different tube types and biasing may still be needed.
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Product Reviews

5.00 out of 5 based on 2 reviews - April 18th, 2014

I just wanted to update my original post. I bought a quad of these JJ 6CA7's for my 50 watt Marshall so I would have a pair on hand when the first pair was used up. I ran the first pair for over two and a half years! One day I noticed a change in the sound; checked the bias and one of the tubes would not give any bias reading at all. Before that they never wavered; sounded great and the bias was always spot on. Two and a half years of life out of power tubes in a Marshall is pretty impressive. I still love these tubes and will be ordering some more now that I finally had to install my backups. - July 16th, 2011

I just put a pair of these in my 73 Marshall after a Winged C EL34 gave it up. I love these new 6CA7's! Low end is tight, nice harmonic content when over driven, and a nice, almost Fender-ish sparkle when you back off guitar volume. Played my first gig with these tubes last night, started off with my volume knobs where I used to set them with EL34's and had to turn down after the first song. I think JJ has a winner with these new tubes, and service and shipping from Amplified Parts stellar as always.

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